XF 1.5 NavTab Execution Order

I was asking in an add-on thread how to hide the Media URL so that I could use an add-on to place my own navigation menus in the order that I wanted but got told an easier way would be to alter the navtab execution order for the items in the navigation.

I have five items: Chat / Media / Streams / Donate / Guilds

I noticed that some of these were set to 10 by default and two had 95/96 so I tried changing them to 50, 55, 60, 65 and 70 to see if that would alter the navigation order and it made no difference. Is it possible to do this or am I doing something wrong?